When a mechanic/targeter/etc. tells you one of your attributes can be a Shape and it links to this page, it means that its value can be any among the following ones:

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And that the mechanic/targets/etc. in question can make use of the additional attribute specified in the SHAPE used when it is used.

SPHERE

Attribute	Aliases	Description	Default
radius	r	The radius of the sphere shape	5.0
livingonly	living, l	Whether to target only living entities	true

CUBE

Attribute	Aliases	Description	Default
radius	r	Half the length of one of the cube’s edges	5.0
livingonly	living, l	Whether to target only living entities	true

CYLINDER

Attribute	Aliases	Description	Default
radius	r	The radius of the cylinder	5.0
height	h	The height of the cylinder	5.0
yOffset	offsety, yo	The y offset	0