M1R and M1L
Instructional Knitting Video
M1 (or make 1) is an increase used in knitting that is less visible than the usual kfb (knit into the front and the back of the same stitch, aka the bar increase). This video explains how to work both the M1R (right leaning) and M1L (left leaning) increases.
How to M1R and M1L from Kaleidoscope Yarns on Vimeo.