Yes

Alphabet trademarks refer to trademarks that use the smallest writing unit of pinyin characters or phonetic symbols, including pinyin characters, foreign letters such as English letters, Latin letters, etc. It can consist of abbreviations, prefixes, meaningless combinations of letters, or even single letters.

Due to the limited number of letters, the registration of letters has been strictly restricted. Trademarks consisting of less than two letters are generally not considered to be inherently distinctive, or must be combined with special fonts or colors, or evidence of acquired distinctiveness must be provided, otherwise they cannot receive trademark protection.

Generally speaking, single letters or numbers cannot be registered in most censorship countries around the world due to their lack of distinctiveness. Therefore, there must be more than two letters or numbers before it can be used as a word mark.