Shadow Blade
From Hard Drop Tetris Wiki
A Shadow Blade is a specific build order for T-spin, in which one places J(L) first, and later soft drops a Z(S) to finish part of a T-spin.
Example: http://fumen.zui.jp/?v110@LeA3mbD3kbE3kbH3gbB3pbA4GNeJwnbIwobIw4bAAA?PeQpnbRpnbQp3bAAA