In English, you often see people who write certain letters or numbers with an extra stroke to differentiate them from similar characters, for example people will write a z with a horizontal stroke to differentiate between "z" and "2". Similarly 7 is sometimes written with a horizontal line through it to differentate it from the number 1. There is also the slashed zero / dotted zero to cleanly differentiate 0 (0
) from O (O
).
I often have a lot of trouble clearly writing certain pairs in a cleanly distinguished way, for example, シ and ツ, ソ and ン, and to a much lesser extent the pairs ユ and コ and サ and せ. Is there a standard variant form for these characters, or do you just annotate it with its counterpart from the other kana when you want to be absolutely clear about it, like [シ]{し}?
There is a related question about distinguishing certain kanji from similar-looking kana, but that is not a problem I've really had.