Subject : WANTED - unicode sans font with differentiated Il1| & O0

I've been trying to find a simple sans serif font for a specialist mathematical programming language that uses special symbols (available in unicode fonts). Some unicode fonts have inconsistent symbols sizes eg Tahoma and Verdana, DejaVu sans has advanced logic symbols (the round ones) that are consistent in size but larger than all the other symbols.

These fonts render some or all of vertical bar, capital I small L and digit 1 identically. This is unacceptable in a programming language where a single wrong character can cause a bug that is very difficult to trace (the program will look right). Capital O and zero also need to be obviously different.

There are fonts that deliberately differentiate between (some) these characters, eg MS Reference Sans Serif has different characters for lower case L, digit 1 and capital i, but unfortunately the lower case L is just a vertical line and easily mistaken for the vertical line character which is used in programming language.

If anyone knows of an ideal unicode sans font, please let me know.

Alternatively, a font designer might want to deliberately create a font that is perfect? Perhaps by combining two open source fonts and/or adapting an OpenSource font such as DejaVu Sans Unicode ? If anyone wants to create such a font, here are more details. For differentiation, the vertical bar should be the only character in the font that is represented as a pure vertical line. Lower case L should have a small bend to the right at the bottom of the stalk. Upper case i should have cross bars at top and bottom. Digit one should have a small angled bar at the top of the stalk on the left hand side. The zero character should be narrower than the letter O, but not have a dot or line though it (to avoid it resembling other symbols). The advanced logic symbols ●○◐◍◉◖◗ should be of similar size to each other and not be larger than other symbols in the font (but should be noticeably larger than the bullet and empty bullet symbols). The arrows ↑↓→←↕↔↖↙↘↗ should be of similar weight. The Lucida range of symbols is almost ideal already, and they look nice, but are not open source. All the other unicode fonts I have seen have arrows of different weights (looks bad) or logic circles that are different sizes (or all large and out of scale to all the other symbols in the font).

For any questions or answers feel free to contact me Connor - SpecialistProgLang @ TackleAnything.co.uk

Thanks for your help.