A chisel point, highlighter-type mark. This is the marking pen I use most on my needlework projects and the one I recommend in the Snowflake Sampler 2021 Block of the Month. Write on the fabric to mark where you will stitch, after stitching the marks will disappear with heat from an iron, hair dryer, or clothes dryer. I’ve used this color for a few years now and I love it.
Disclaimer- Test on an inconspicuous area and make sure you are ok with its performance on your chosen fabric before using regularly.