Nice! I have one of my (fore)name that uses the same trick of having two parallel strokes be separate letters in one orientation and a mere embellishment of one letter in the other. But I don't have a version of it as polished as Alconja's above.
@GarethMcCaughan Pub lunch time for me, but it's pretty quiet at work, so when I get back I'm going to have a crack at a "Gareth". :) Seems like some clean symmetry to work with.
For another "avigram", you could integrate the i into the V. But I grant that it doesn't look as playful and as elegant as Alconja's design. More like a bad 80's logo for AVI Bussiness Solutions plc.
Across
3. Extraordinary claim: He is 13 across after 9 down (7)
6. Crashed ashore, sounding rough (6)
8. Got away from David and Edward going separate ways (6)
10. General supermarket chain from Germany follows Italy's #1 in fashion (9)
12. Rights to incorporate a compression f...
@MOehm Nope. Lowercase "g" at the start; its descender has two parallel strokes, which on rotation turn into the verticals of the "t" and "h" at the end.
@Avi I guess it could indicate something coming after something else - as in "A succeeded B" could indicate "BA" although "A succeeds B" might be better.
In the clue above it just looks like "succeeded" may be representing the letter "S", which I'm not totally sure about.
Well, to succeed means to come after, not to be at the end of, so I'd use it only for positioning parts of the wordplay. And S for succeeded is, for example, defined here.