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As a local variable:
	returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};

As a property:
	@property (nonatomic, copy, nullability) returnType (^blockName)(parameterTypes);

As a method parameter:
	- (void)someMethodThatTakesABlock:(returnType (^nullability)(parameterTypes))blockName;

As an argument to a method call:
	[someObject someMethodThatTakesABlock:^returnType (parameters) {...}];

As a typedef:
	typedef returnType (^TypeName)(parameterTypes);
	TypeName blockName = ^returnType(parameters) {...};