- Age old calculators
- Chinese calculators
- Early calculators
- Simple calculators used since ancient times
- of Abacus
- A posterior taken by surprise
- Shocked, taken ...
- Stunned, taken ...
- Surprised, taken ...
- Take one rugby player by surprise
- Unknowingly
- Toward the back or rear; backward.
- Ancient bead counters
- Beaded counting frames
- Chinese calculators
- Early calculators
- of Abacus