When emoji appear in front of sentences, they're meant to help you better understand the context of specific sentences.

In the following example, you can tell that this sentence takes place during a telephone conversation (☎). Moreover, the (↑) in front of "you" shows polite/formal register:

A reference list on emoji that you might see during your training:

⚥ neuter voice

♂ male voice

♀ female voice

↑ polite/formal register

↓ impolite/informal register

↡ rude register

📈 Business

✈ Travel

🗫 Social

⛅ Weather

🏠 Home

🏫 School

🌱 Basic

💓 Health

😲 Feelings

📖 Knowledge

💰 Money

🛒 Shopping

💼 Work

☎ Telephone

🍴 Food

👏 Praise

🚴🏃 Exercise

🚦 Traffic

⛍ Accident

⚕ Doctor

🔫 Crime

💁 Service

🖕 Rude

🏨 Accommodation

🔥 Emergency

📢 Suggestion

💊 Medical

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