What are the meaning of the warning lights on the dash board?

That sounds like a TPMS (Tyre Pressure Warning System) Light. If that's the case check your PSI by blowing tyres up to recommended PSI levels (this will be on your doors) or resort to owners manual.

Alternatively check this guide on all dash lighting http://www.carbuyer.co.uk/tips-and-advice/152578/car-dashboard-warning-lights-the-complete-guide OR

https://www.mynrma.com.au/cars-and-driving/car-servicing/resources/what-do-my-dashboard-warning-lights-mean

That is your Check Engine Light. There is a trouble code detected by the car's computer. Have the codes read to find out what the problem is.

i have a light that comes on my audi a3 1.8t dash board .it is round with a cross through it and like a little box on top can any one tell me wat this is thanks

I believe it's the washer fluid light

Here's a list of your dash lights and their meanings

Left
1. Door-ajar warning light
2. Oil pressure warning light
3. Check engine warning light
4. Tour or Sport for the ECS
5. Security indicator

Center Warning Lights
1st space down
Left: 4-wheel steering oil level warning light
Right: Brake warning light
2nd space down:
Left: Anti-lock brake warning light
Right: Active Exhaust Tour indicator
3rd space down
Left: cruise control indicator
Right: cruise control ON indicator
4th space down:
Left: charging system warning light
Right: High-beam indicator

Right Warning Lights
1st down: Not used
2nd down: Seatbelt warning light
3rd down: Washer fluid (2 storage containers)
4th down: Supplemental restraint system (SRS) warning light

if its yellow and on the tachometer side of the dash it means you have a burnt out bulb.

that light means you have a problem with the emission system of the car ity could be anything from a loose gas cap to a failed sensor . As long as the light isnt flashing then you can drive the car untill you get it checked out. If the light is FLASHING then DONT DRIVE THE CAR.

Could be the motor-management-warning light, but I guess it's the break-warning light. There might be too little breaking-fluid left in the lines ... A boardcomputer-readout should clarify this.

Otherwise, try parking on an ascending road with the nose pointing up, hit the hand-break and wait like 2 minutes; the light should come on. You might wanna retry it with the car's nose pointing downwards as well ... If so, definitely the breaking-fluid, otherwise probably not ;)

In any case - flashing warning light are never ok, so when you see it again and you're sure it's not just the ABS/ESP warning light, go and have your boardcomputer read-out, since it should contain useful errorcodes ..

Semi-solved. It looks to be some sort of headlight warning. Fog lights?
I'm still investigating.

It the brake pad warning light, prob need your pads changing!

Is that not the warning light for your cruise control?