It means playing the piano with the left hand.

l and h are German musical terms. Musical terminology refers to the professional terminology used to guide performers in music performances, which means playing the piano with the left hand.

The violin is a stringed instrument. There are always four strings. The sound is produced by the friction between the string and the bow. The violin body and sound box are about 35.5 cm long and are made of curved panels, back panels and side panels. Panels are often made of spruce, which has a softer texture. The back and side panels are made of maple and mahogany, which are hard in texture. The headstock and neck are made of solid maple, and the fingerboard is made of ebony. The violin is widely spread all over the world and is the most important instrument in the string section of modern orchestras. It occupies a very important position in instrumental music and is the backbone of the modern symphony orchestra. It is also a solo instrument with difficult performance skills. It is also known as the three major musical instruments in the world along with the piano and classical guitar.