The '03' indicates 3 positions. The '01.5' is a dimension, likely related to stacking height or contact length. '-L' specifies 10 µ" (0.25 µm) Gold on the contact and Matte Tin on the tail. '-TR' indicates Tape & Reel packaging. The meanings of '-V', '-S', and '-W' are not explicitly detailed in the provided source. UMPT identifies the mPOWER Ultra Micro Power Terminal series of connectors from Samtec.