弯脚 meaning in English

clubfoot
swan neck bracket

Measuring instruments for anthropometry - spreading caliper for anthropometry
人体测量用弯脚规
Moreover the need explanation is , in this chart the multi - purpose plugdirection is fixed , only may meet inserts the straight hairstyle plug , elbow the type plug is cannot meet inserts , must change themulti - purpose plug 90
另外需要说明的是，在此图中万能插座的方向是固定的，只可接插直头式插头，弯脚式插头是不能够接插的，必须将万能插座转向90度。