03

Ternary numeral system, also known as base-3 system, is a counting system based on three digits: 0, 1, and 2. In the ternary system, each number is represented by a sequence of 0s, 1s, and 2s, where each digit represents a certain power of 3. Therefore, each digit in the ternary system is called a trit, and three trits form a tritade.

Like in the binary and decimal systems, each number in the ternary system can be represented as a sum of powers of three, where each power is equal to 3 raised to some exponent. For example, the number 102 in the ternary system represents 13^2 + 03^1 + 2*3^0 = 11 in the decimal system.

Although the ternary system is rarely used in everyday life, it can be useful in some areas such as coding theory and cryptography, as well as for educational purposes as an example of a number system.

In the quinary (base 5) numeral system, the number 3 is represented by the digit "3". As in other numeral systems, each digit in the quinary system represents a certain power of the base, which in this case is 5.

Therefore, the number 3 in the quinary system can be expressed as 3*5^0, which is equal to 3 in the decimal (base 10) system.

Alternatively, the number 3 in the quinary system can be represented by a single digit of three. Thus, the number 3 in the quinary system is written as "3".