Find the odd term (zodiac sign vs geographic line): Select the option that is not a sign of the zodiac.

Introduction / Context:
Many vocabulary classification tasks separate astronomical or astrological terms from geographic terms. Zodiac names refer to constellations used in astrology, whereas the Equator is an Earth reference line in geography. The category mismatch provides a clear odd-one-out.

Given Data / Assumptions:

• Scorpio: zodiac sign based on the Scorpius constellation.
• Cancer: zodiac sign.
• Capricorn: zodiac sign.
• Equator: an imaginary line around Earth equidistant from the poles; not a constellation or zodiac sign.

Concept / Approach:
Group by domain: zodiac signs versus geographic references. Three are astrological; one is geographic.

Step-by-Step Solution:

Verification / Alternative check:
Check usage: zodiac signs appear in horoscopes and star charts; the Equator appears in maps and Earth science.

Why Other Options Are Wrong:
They all belong to the same astrological set.

Common Pitfalls:
Do not confuse the Tropic of Cancer and Tropic of Capricorn (geographic lines) with the zodiac signs; here, the word Equator is the only pure geographic line listed.

Final Answer:
Equator