"To form the letter" refers to the process of creating or writing a specific letter of the alphabet. It means to shape the lines and curves that compose the letter in order to represent a particular sound or symbol. Full definition
It is also important to make sure you don't randomly send form letters to a bunch of potential employers. (exforsys.com)
You're reading job postings carefully, customizing your cover letter to address what you see, and doing your homework to ensure your correspondence doesn't sound like form letters. (theladders.com)
This hands - on, tactile activity helps reinforce the concept of forming letters with the hands, and may help prepare your child for handwriting. (childdevelopmentinfo.com)