1. 导向柱：guidelineless drilling 无导向索钻井 | guidepost 导向柱 | guides 导向器

2. 路标：1.交通规则trafficregulation | 2.路标guidepost | 3.里程碑milestone

3. 导柱：下模座 lower die set | 导柱 guidepost | 导套 guide bush

4. 引导柱：guidepin导梢 | guidepost引导柱 | guideplate导板

noun

1. a rule or principle that provides guidance to appropriate behavior

    Synonym: guidelinerule of thumb

2. a post bearing a sign that gives directions or shows the way

    Synonym: signpost