Of course. Using letters instead of signatures is more convenient and concise, which can reduce the number of words, improve efficiency and protect the privacy of personal information. Using letters instead of signatures can play a role in identifying individuals, but it is necessary to abide by relevant laws and regulations to ensure the legitimacy and effectiveness of signatures. On some formal occasions, such as signing contracts, power of attorney, etc. , or use your real name or official signature to ensure legal effect and recognition.