Artist: @kriskowal
The icon is itself a T, though the vertical bar is broken. The icon is a depiction of four TChannel messages. The beam at the top of the T is blocking the head of the line, so it gets fragmented into two packets, and the dashed segment is the period where the message is pending on the wire, allowing three other small messages to be transmitted concurrently. The x axis is of course time. The y axis is messages by id, in no particular order, or rather, in incorrect order the better to resemble the broken trunk of the T. Each message is divided in three “arguments”. I’ve always assumed the T in TChannel stood for 3.