Symbol
Use a symbol key table to decode letters or numbers.
Symbol
Symbol Coding
What you'll learn
- Use a symbol key table to swap letters/numbers.
- Each symbol stands for one letter or digit.
- Decode by looking up symbol → letter.
- Build table from given examples first.
Key concepts
Level 1 — Core idea
Verbal: ★ means A, ● means B — ★● means AB.
Symbolic: Symbol ↔ letter bidirectional map.
Visual: Two-column chart: Symbol | Letter.
Level 2 — Going deeper
If ★● = 12, maybe ★=1 ●=2 — check other words in question. Consistent mapping always.
NCERT anchor
NCERT Math Mela, Chapter 4 picture symbols appear in patterns — same lookup idea.
Worked example
Key: △=C, ○=A, □=T. Decode △○□.
Step 1 — Look up each symbol
Step 2 — △→C, ○→A, □→T
Answer: **CAT** ✓
If @=5 and #=3, what is @# as two-digit number?
Step 1 — Join digits in order
Step 2 — @ then # → **53**
Answer: **53** (if question asks number string)
Common mistakes
| Mistake | Why | Fix |
|---|---|---|
| Guess symbol without table | Random assign | Build key from data |
| Swap symbol meaning mid puzzle | Inconsistent map | One symbol = one value |
| Ignore order | ○△ vs △○ | Left to right order |
| Letter when number asked | Format miss | Read word vs number instruction |
Quick check
- Make key: heart=S, star=T — decode heart-star.
- Why write table first?
- One symbol can mean two letters?
- Stretch: Create your own 3-symbol code for a friend's name.
Revision tip: Draw table before decoding — never decode from memory alone.
Open the Practice tab for graded questions on Symbol Coding.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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