What are the signs in piano playing and the meaning of them?

There are different kinds of signs and symbols in the piano music. Some even include pictures that cannot be attached here. Therefore I'll give some signs and you can check out the links below for the pictures.

Tempo markings tell the pace (or speed) which are to play

The tempo is usually marked at the top of the piano piece, before you begin. Sometimes songs will change tempo in middle of the song. The composer will write when to change the speed. There are not any special markings for the tempothe Word is just written out.

Adagio

Adagio: slowly

Andante

Andante: walking speed

Moderato

Moderato: moderate tempo

Allegretto

Allegretto: rather fast

Allegro

Allegro: fast and lively, cheerfully

Vivace

Vivace: very fast

pp

Pianissimo: very soft

p

Piano: soft

MP

Mezzo piano: moderately soft. Mezzo means moderately in Italian. Anything with mezzo written before it means moderately.

MP

Mezzo forte: moderately loud

F

Forte: loud

ff

Fortissimo: very loud