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Small marks that describe something else rather than standing alone — an account, a message, an app icon. Two of them are ticks in the same applications and are routinely mistaken for each other: one sits beside a name and concerns identity, the other beside a message and concerns delivery. What the first certifies now depends on the platform, which is the most useful thing that record can tell a reader.
A tick inside a coloured disc, marking an account as checked.
One or two ticks beside a message, reporting how far it has got.
A small filled circle on the corner of an icon, marking something unseen.