NameError: name 'feather_numm' is not defined

代码如下：
for i in range(feather_num):
draw_line(feather_gap,angle + 180, False) # 箭柄，不折返
draw_line(feather_length,angle + 145, True) # 羽翼，要折返
draw_line(feather_length,angle + 145, False)
draw_line(feather_num*feather_gap, angle, False)
draw_line(feather_length,angle + 145 + 180, False)
for i in range(feather_num):
draw_line(feather_gap, angle + 180, False) # 箭柄，不折返
draw_line(feather_length, angle - 145, True) # 羽翼，要折返
draw_line(feather_length, angle - 145, False)
draw_line(feather_num * feather_gap, angle, False)
draw_line(feather_length, angle - 145 + 180, False)

报错：
D:\pycharm2020\Code\venv\Scripts\python.exe D:/pycharm2020/Code/aixin.py
Traceback (most recent call last):
File "D:/pycharm2020/Code/aixin.py", line 105, in
for i in range(feather_numm):
NameError: name 'feather_numm' is not defined

不是feather_num吗
feather_numm是什么