What special symbols can be used in League of Legends names without being illegal?

Special symbols that can be used in League of Legends names but are not illegal include: (dian), (huo), (shu), (pie), horizontal and vertical strokes, etc.

Other special symbols:

罒gang, 水shu, 灬, huo, 博du, 亻dan, 爹bao, 亠wen, 冫liang,

冖tu,蠠yan,婩dan,youyou,扌ti,囗wei,彡san,犭fan,夂dong,

饣shi,忄shu,丬jiang,氵san,宀 bao, 辶zou, 屮cao, 纺jiao,

浵fan, 礻shi, 酅jin, 疒bing, 衤yi, 虍hu.

Extended information:

Lol League of Legends Naming Standards

The name of a League of Legends game character can use up to 16 characters or 8 Chinese characters.

In League of Legends, the summoner’s name will be the name of other players, and the length of the nickname must be between 3 and 16 characters, and between 3 and 8 Chinese characters. Among them, Chinese characters count as 2 characters, and letters and numbers count as 1 character. Letters, numbers, and Chinese characters are allowed, but insulting words are not allowed.

A recognizable and appropriate nickname is an important guarantee for communicating with other summoners in Summoner's Rift. When naming, use Chinese, English and numbers, and do not use special characters.