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sign 

        # BigDecimal.sign

(from ruby core)
---
    sign()

---

Returns the sign of the value.

Returns a positive value if > 0, a negative value if < 0, and a zero if
== 0.

The specific value returned indicates the type and sign of the
BigDecimal, as follows:

BigDecimal::SIGN_NaN
:   value is Not a Number
BigDecimal::SIGN_POSITIVE_ZERO
:   value is +0
BigDecimal::SIGN_NEGATIVE_ZERO
:   value is -0
BigDecimal::SIGN_POSITIVE_INFINITE
:   value is +Infinity
BigDecimal::SIGN_NEGATIVE_INFINITE
:   value is -Infinity
BigDecimal::SIGN_POSITIVE_FINITE
:   value is positive
BigDecimal::SIGN_NEGATIVE_FINITE
:   value is negative

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