It is a deep bow. The two m letters are hands flat on the floor, and (_ _) is a head bent so low that you only see the top of it. People use it to say thank you, please or sorry. It comes from Japan, where the deepest bow, kneeling with the head to the floor, is called dogeza.
How do text faces show speed?
Comics draw lines behind a runner to show wind and dust. Kaomoji do the same with letters. The Greek letter ε looks like a puff of dust, and = or ≡ look like the lines. More lines mean more speed.
Speed marks
εU+03B5Greek small letter epsilon. A puff of dust.
≡U+2261Identical to, a math sign. Three wind lines.
ΣU+03A3Greek capital letter sigma. A big burst of speed.
Sleeping and tired faces
Closed eyes are usually a line or a curve, like -.- or ︶. Many sleeping faces lie down in bed, made from brackets and box lines.
The wizard and the magic sparkles
In (∩ ͡° ͜ʖ ͡°)⊃━☆ﾟ. * the hand holding the wand is ⊃, the math sign for "superset of". The wand is a thick box drawing line, and the sparkles are a star and small Japanese sound marks.
