What is the meaning of "rit" on the piano score?

The relationship between 123456734 and 7 1 is chromatic rit: Seeing this sign means that we need to slow down here, which is the abbreviation of ritardando, which means that you can find chromatic and full tones on the Internet yourself. Divide an octave into twelve equal parts, each equal part is a semitone, and two semitones are equivalent to a whole tone. A semitone is equivalent to two degrees, and a whole tone is equivalent to two degrees. A chromatic scale is called a chromatic scale because the interval between two adjacent tones is chromatic. The diatonic scale is called "diatonic scale" because the interval between two adjacent tones is diatonic.