A delimiter is an extra key you press to trigger a snippet expansion after you type the abbreviation. You can choose whether you want a delimiter to disappear after use, or remain.
In Preferences > Expansion, the menu "Expand abbreviations:" has two choices for delimiter behavior:
- at delimiter (keep delimiter)
- at delimiter (abandon delimiter)
To override this setting for a specific snippet, add a "Keep delimiter" specifier ("%+", without the surrounding quotation marks) or an "Abandon delimiter" specifier ("%-") to the very end of your snippet.