What is "virginia rail fence"

Fence \Fence\ (f[e^]ns), n. [Abbrev. from defence.]

1. That which fends off attack or danger; a defense; a protection; a cover; security; shield.

   Let us be backed with God and with the seas, Which he hath given for fence impregnable.
   --Shak.

   A fence betwixt us and the victor's wrath.
   --Addison.

2. An inclosure about a field or other space, or about any object; especially, an inclosing structure of wood, iron, or other material, intended to prevent intrusion from without or straying from within.

   Leaps o'er the fence with ease into the fold.
   --Milton.

   Note: In England a hedge, ditch, or wall, as well as a structure of boards, palings, or rails, is called a fence.

3. (Locks) A projection on the bolt, which passes through the tumbler gates in locking and unlocking.

4. Self-defense by the use of the sword; the art and practice of fencing and sword play; hence, skill in debate and repartee. See Fencing.

   Enjoy your dear wit, and gay rhetoric, That hath so well been taught her dazzing fence.
   --Milton.

   Of dauntless courage and consummate skill in fence.
   --Macaulay.

5. A receiver of stolen goods, or a place where they are received. [Slang]
   --Mayhew.

   Fence month (Forest Law), the month in which female deer are fawning, when hunting is prohibited.
   --Bullokar.

   Fence roof, a covering for defense. ``They fitted their shields close to one another in manner of a fence roof.''
   --Holland.

   Fence time, the breeding time of fish or game, when they should not be killed.

   Rail fence, a fence made of rails, sometimes supported by posts.

   Ring fence, a fence which encircles a large area, or a whole estate, within one inclosure.

   Worm fence, a zigzag fence composed of rails crossing one another at their ends; -- called also snake fence, or Virginia rail fence.

   To be on the fence, to be undecided or uncommitted in respect to two opposing parties or policies. [Colloq.]