In the Japanese Anime Industry, Tsume Shiji (ツメ指示), or spacing charts, are used to show where the Inbetween Frames are drawn between two Key Frames!
Some Terminology:
両詰め (Ryōdzume) - Both Ends Spaced
先詰め (Sakidzume) - Slow In
後詰め (Atodzume) - Slow Out
均等割 (Kintōwari) - Equally spaced Inbetweens
