A spade is a digging tool, with a broad pointed blade attached to a long handle. The blade is frequently drawn with an iron edge reinforcement. The spade is a period charge, found in the allusive arms (German graben, “to dig”) of von Grabmer or Graben, c.1450 [Ingeram 14; also Siebmacher 44].
If the blade is square instead of pointed, the tool may be termed a “shovel” [Franklyn 309], but such artistic distinction carries no heraldic difference.
The spade and shovel are palewise by default. Society usage places them with their blades to base by default; this seems to follow English usage [Parker 543], though contrary to German usage. For related charges, see hoe, trowel.
Aurelia Ruhlander bears: Sable, two spades inverted in saltire Or.
John Gardener of Barley Marsh bears: Per chevron vert and bendy Or and sable, in chief two shovels Or.
Johannes Stürmære bears: Per bend gules and sable, a shovel bendwise sinister argent.