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One or two ticks beside a message, reporting how far it has got.
Also known as: Blue ticks, Double tick, Delivery ticks
One tick means sent, two mean delivered, and two in a different colour mean read. The scheme is per-application rather than standard, and the colour change carrying the most socially consequential meaning is the part users most often have wrong.
Report a message's progress: typically one tick for sent to the server, two for delivered to the recipient's device, and two in a contrasting colour for read.
Contexts: Software
Not standardised. Each messaging application chooses its own scheme, and the same two ticks mean delivered in one and read in another.
Read receipts can usually be switched off, in which case the ticks stop advancing — so the absence of a read mark does not establish that a message was not read.
One or two tick marks side by side, each a short stroke descending to the left and a longer stroke rising to the right, set beside the message.
Both are ticks in the same applications. These sit beside a message and describe delivery; the verified badge sits beside a name and describes the account.