Glossary
This glossary defines Kioku’s canonical vocabulary. The documentation and the UI should use these terms with the spelling and capitalization shown here. When you need a word for one of these ideas, use the one here rather than inventing a synonym.
Content model
Section titled “Content model”Element
Section titled “Element”The shared name for your learning content. Topics, Extracts, and Items are all Elements, the same kind of object playing different roles.
Reading material: an imported article, web page, or PDF that you read incrementally. Topics are scheduled for re-reading on their own rhythm, separate from your flashcards.
Extract
Section titled “Extract”A passage you pull out of a Topic because it’s worth remembering. Extracts sit between reading and recall: they preserve context, and you can promote them into one or more Items.
A flashcard, the smallest unit of recall. Items are scheduled by FSRS. An Item has a Card that defines what is shown and what is hidden.
The presentation layer of an Item: how it renders, and the fields that make up its front and back. Cards can be simple question-and-answer, fill-in-the-blank (cloze), or image occlusion.
Source
Section titled “Source”An imported document a Topic comes from: its URL, title, and content. One Source can yield many Topics.
Collection
Section titled “Collection”A self-contained body of work: your Elements, Cards, review history, and settings. Collections isolate data and can be exported, imported, and switched between.
Where a deleted Element goes, together with everything inside it. It stays in the Trash for 30 days, and you can restore it to where it was; after that, or when you empty the Trash, it is deleted for good. Browse lists it under State → Trash.
Reading & extraction
Section titled “Reading & extraction”Incremental reading
Section titled “Incremental reading”Reading a Source a little at a time across many sessions instead of all at once, interleaved with reviews and with other Sources. See Incremental reading.
Highlight
Section titled “Highlight”A span of text you mark inside a Topic. Highlights are the raw material for Extracts.
A fill-in-the-blank deletion written as {{c1::hidden}} or
{{c1::hidden::hint}}. Each distinct cloze number creates a separate Card. See
Cloze syntax.
Image occlusion
Section titled “Image occlusion”A Card type that hides regions of an image and asks you to recall what’s beneath them.
Audio cloze
Section titled “Audio cloze”A Card type that plays a recording with a stretch hidden (by a soft tone, silence, or stopping before it) and asks you to recall what was said there. Each hidden stretch of a recording becomes its own Item. See Card types.
Static import / Live import
Section titled “Static import / Live import”Static imports save a clean copy of the page at import time. Live imports keep only the URL and load the page during review, so the content stays current.
Thread mode
Section titled “Thread mode”A live-import setting that lets you navigate within the same domain during review without triggering a “navigated away” warning.
Scheduling & review
Section titled “Scheduling & review”Spaced repetition
Section titled “Spaced repetition”Scheduling reviews at increasing intervals timed to just before you would forget. This maximizes retention per minute studied.
Free Spaced Repetition Scheduler (version 6 in Kioku), the algorithm that schedules Items. It models each Item’s memory with stability and difficulty and predicts retrievability over time. See Spaced repetition.
Stability / Difficulty / Retrievability
Section titled “Stability / Difficulty / Retrievability”The three quantities FSRS tracks per Item. Stability is how long memory lasts; difficulty is how hard the Item is to retain; retrievability is the probability you’d recall it right now.
Retention
Section titled “Retention”The probability of recall you target at review time. Higher retention means more frequent reviews; lower retention means fewer reviews but more lapses. You can change it in settings.
Review
Section titled “Review”A single scheduled encounter with an Item, ending in a rating.
Rating
Section titled “Rating”Your grade on a reviewed Item: 1 = Again, 2 = Hard, 3 = Good, 4 = Easy. The rating feeds FSRS to compute the next interval.
Topic action
Section titled “Topic action”The equivalent of a rating for a Topic: read, extract, skip, or done. Topic actions decide when a Topic comes back.
The ordered set of Topics and Items due in a session. The review queue interleaves reading and recall.
Reschedule
Section titled “Reschedule”Recomputing future due dates (for one Element or in bulk) after a settings change such as a new retention target.
Suspend
Section titled “Suspend”Take an Element out of the queue for now, keeping its schedule, until you Resume it. Use it for material you want to set aside, not finish. Browse lists suspended Elements under State → Suspended.
Dismiss
Section titled “Dismiss”Mark an Element as finished, so it leaves the queue. Marking a Topic Done in review dismisses it. Unlike Suspend, dismissing says you’re done, not that you’re pausing; Restore to Queue brings a dismissed Element back. Browse lists them under State → Dismissed.
Advanced
Section titled “Advanced”Concept
Section titled “Concept”A way to group related Elements in Browse, distinct from tags.
Reference (ref)
Section titled “Reference (ref)”A link between Elements, for example an Extract back to the Topic it came from.
The SuperMemo Plan: a tool for laying out a study day as scheduled activities, running it, and reviewing how actual time compared to the plan.
Collection switching
Section titled “Collection switching”Changing the active Collection, so you can work in one self-contained body of material at a time.
See also
Section titled “See also”- Core concepts: narrative explanations of the model.