ろ゚

 

Japanese Wikipedia has an article on:

ろ゜

Wikipedia ^ja

The character ろ with a handakuten.

• IPA^(key): [ɾo̞]

ろ゚ • (lo) 

1. (nonstandard, linguistics) The hiragana syllable ろ゚ (lo). Its equivalent in katakana is ロ゚ (lo).

[l] is an allophonic variation of /r/ in Japanese. This character is not used in standard Japanese, but instead for distinction between the two allophonic variations by Japanese linguists.