Numeral system, an Uncommon card

A numeral system is a writing system for expressing numbers without words, that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner.
From the Wikipedia article

Rarity: Uncommon
Domain: Science
ATK: 69
DEF: 33
Power: 102
Wikipedia reads a year: 170,000

Power 102 (ATK + DEF): stronger than 55 % of WikiCards cards.

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Numeral system quiz: 3 questions

Three questions on the Numeral system card, the way WikiCards duels ask them. Pick an answer, the facts are just below.

Find the missing word
The number the numeral ______ is called its value.
Answer
represents. The number the numeral represents is called its value. From the Numeral system article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Numeral system. Numeral system 69 · List of Oldenburgish consorts 66 · Index of Tennessee-related articles 63 · 689th Combat Communications Wing 54 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
Numeral system. Numeral system 170,000 · Brocade 98,000 · Index of Tennessee-related articles 760 · MALSU1 340 Wikipedia reads over a year.

In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.

The facts on the card

The card carries these facts from its Wikipedia article.

The same sequence of symbols may represent different numbers in different numeral systems.
For example, "11" represents the number eleven in the decimal or base-10 numeral system, the number three in the binary or base-2 numeral system, and the number two in the unary numeral system.
The number the numeral represents is called its value.

Why it is Uncommon

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Numeral system article was read about 170,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 69 and blocks with 33: each hit it takes is cut by 13 %.

How to get Numeral system

Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.