From the same as luwl; a loop -- loop.
see HEBREW luwl
H3924. lulaah
[לוּלַי] noun feminine loop (probably from לולו; compare [דוּדַי] p. 188 above; ZehnpfBAS i. 635, compare Assyrian lu-lu, 'Schleife'); — only plural absolute לָֻלָאֹת Exodus 26:5 (3 t. in verse) + 8 t., construct לֻלְאֹת 26:4; 36:11; — loops on edges of curtains of tabernacle, matching the hooks (קְרָסִיםׅ, for joining the ourtains: 26:4-5, (3 t. in verse); 26:10 (twice in verse); 26:11; 36:11-12, (3 t. in verse); 36:17 (twice in verse) (all P).
לוּלֵי see לוּלֵא below לוּ.