namark/libsimple_motion: what even is a tween? @ 6db2dc974a27d1fafc33201942b6b3a33d8c8fa9

what even is a tween?

namark 6db2dc974a allinclude		10 месяцев назад
source	6db2dc974a allinclude	10 месяцев назад
unit_tests	2dbc37866b Default constructed melody considered empty/done.	4 лет назад
.gitignore	564130634c Initial state extracted from sketchbook.	4 лет назад
COPYRIGHT	e1af1c5cf3 Updated copyright.	1 год назад
LICENSE	23f5334312 copyright license files	4 лет назад
Makefile	564130634c Initial state extracted from sketchbook.	4 лет назад
README.md	564130634c Initial state extracted from sketchbook.	4 лет назад

what even is a tween? shorthand for between?? what even is between???