Traditionally, we can find a violin, cello, viola, and bass used in an orchestral arrangement.
string section
The Double Bass is a string instrument. Other instruments in the orchestral family of string instruments are the violin, viola and cello.
Bowed and plucked
The Double Bass is part of the String family of orchestral instruments. Other instruments in this family include: Violin Viola Cello And Harp to some extent, although Harps are not bowed string instruments.
If you mean other members of the String family (bowed) of orchestral instruments: Violin Viola Cello
Orchestral string instruments all use 4 strings.
The main orchestral string instruments include the violin, viola, cello, and double bass. The violin, typically the highest in pitch, is often divided into first and second sections within the orchestra. The viola has a slightly deeper tone, while the cello provides rich, warm sounds in the lower register. The double bass, the largest string instrument, offers the lowest pitches and serves as the foundation of the string section's harmony.
percussion eg. timpany, brass eg. trumpet, string eg. violin and woodwind eg. clarinet
The string family is the largest group in the orchestral family
Three string instruments that are typically not found in a standard orchestra are the lute, the viola da gamba, and the harp guitar. The lute is a historical string instrument often associated with Renaissance music, while the viola da gamba is a bowed instrument from the same era, distinguished by its fretted fingerboard. The harp guitar, which combines elements of both the guitar and the harp, is a more modern instrument that rarely appears in orchestral settings.
The four orchestral familes are percussion, brass, strings and woodwinds. However, this is not the true order because persussion instruments do not always have a defined pitch, and they could be in any pitch range. The other three families, brass, string and woodwinds, can be placed in pitch order:Woodwinds (main and related)BrassStrings
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