In Unicode, it is represented by U+12079 (DISH) In the Amarna letters, it is commonly used to denote Male individuals.
Examples of multiple uses in the Amarna letters, is to address the Pharaoh, often as "servant-yours, at 2 Feet, ..
(In CDLI listings (Chicago Digital Library Initiative), it is represented in transcription as ":".
Type 1 can be found in Amarna example letter EA 147.
The high quality photo of EA 364, line 8, shows the length about 3/4 of a full stroke-length.