pin Stitches, little straight stitches over one thread, can be used to start threads. It’s often used in Japanese embroidery. While they are great ways to start threads, it’s very important that your main stitches cover the pin stitches.
Happily, Debbie Rowley of Debbie Rowley of DebBee’s Designs has been doing a series on pin stitches. Here’s a summary, with links, of the pin stitches covers.