Thursday Morning Riddle

Both of law and of thumb, I am often applied;
I’m de facto control; or to truly preside;
A direction for games; for a judge to decide;
And I measure a distance – or more with a slide!

Who am I?

UPDATE: Riddle solved by Elizabeth. See comments for answer.

3 Responses to “Thursday Morning Riddle”

  1. Elizabeth Says:

    Rule

  2. Bill Says:

    RULE is correct. Way to go, Elizabeth!

  3. Elizabeth Woledge Says:

    Can you contact me at elizabeth.woledge@shakespeare.org.uk about taking part in a blogging for shakespeare’s birthday project?
    Liz

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