yes
The Double Bass.
Because the double bass is the largest instrument in the orchestra.
the double bass (as in bass like a cello not a guitar)
That would be the Double Bass, also knows as a Bass Fiddle.
The double bass is the lowest part in the string section of a symphony orchestra. It is usually the lowest part in chamber orchestras as well, if there is no double-bass the lowest part will be played by the cellos. (Do not confuse this with a basso-continuo, which is a harpsichord part in Baroque era (1600-1750) music.)
The deepest voice in an orchestra's string section is the double bass. It provides the lowest pitches and serves as the bass foundation for the string section, complementing the higher strings like violins and violas. The double bass typically plays an essential role in establishing the harmonic and rhythmic structure of the music. Its rich, resonant tones contribute significantly to the overall sound of the orchestra.
String instruments are instruments that have strings on them, eg. Guitar or Violin.
In a string orchestra, the instrument with the lowest pitch is the Bass (also called Double Bass, String Bass, Upright Bass, and Contrabass)
The four stringed instruments in an orchestra: the violin, the viola, the cello, and the double bass.
The smallest orchestral stringed instrument is the Violin. The size of stringed instruments, from smallest to largest, is as follows: Violin Viola Cello Double Bass
in a string orchestra the instruments are: Bass Violin Viola Cello.
The lowest string on a four string double bass is an E string. If you have a fairly rare five string double bass then the lowest fifth string is a B string.